Update scalafmt-core to 3.0.3

[scala-steward]

Updates org.scalameta:scalafmt-core from 2.7.5 to 3.0.3.
GitHub Release Notes - Version Diff

I'll automatically update this PR to resolve conflicts as long as you don't change it yourself.

If you'd like to skip this version, you can just close this PR. If you have any feedback, just mention me in the comments below.

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Files still referring to the old version number

The following files still refer to the old version number (2.7.5).
You might want to review and update them manually.

README.adoc

Ignore future updates

Add this to your .scala-steward.conf file to ignore future updates of this dependency:

updates.ignore = [ { groupId = "org.scalameta", artifactId = "scalafmt-core" } ]

labels: library-update, semver-major, old-version-remains

[codecov-commenter]

Codecov Report

Merging #62 (92efd64) into main (8e78e60) will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##             main      #62   +/-   ##
=======================================
  Coverage   90.24%   90.24%           
=======================================
  Files           5        5           
  Lines          41       41           
=======================================
  Hits           37       37           
  Misses          4        4           

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